Well if all you want are free boat plans then maybe these cracker box plans will suffice.
Hmmm,...
Power Pete's cracker box plans are currently unavailable, but here is the link page
http://powerpete.20megsfree.com/photo4.html
http://powerpete.20megsfree.com/photo3.html
There are also some plans for model boats here
http://www.microhydros.com/
If it is ships you want try [link=http://www.floatingdrydock.com/]Floating drydock[/link] or [link=http://www.taubmansonline.com/cgi-bin/store/shop.cgi]Taubman plans service[/link]